drm/bridge: lt9211: Convert to use maple tree register cache

The maple tree register cache is based on a much more modern data structure
than the rbtree cache and makes optimisation choices which are probably
more appropriate for modern systems than those made by the rbtree cache.
Signed-off-by: Mark Brown <broonie@kernel.org>
Reviewed-by: Neil Armstrong <neil.armstrong@linaro.org>
Signed-off-by: Neil Armstrong <neil.armstrong@linaro.org>
Link: https://patchwork.freedesktop.org/patch/msgid/20231001-drm-lt9211-maple-v1-1-1cf74fb10991@kernel.org

drivers/gpu/drm/bridge/lontium-lt9211.c

@@ -89,7 +89,7 @@ static const struct regmap_config lt9211_regmap_config = {
 	.volatile_table	= &lt9211_rw_table,
 	.ranges = &lt9211_range,
 	.num_ranges = 1,
-	.cache_type = REGCACHE_RBTREE,
+	.cache_type = REGCACHE_MAPLE,
 	.max_register = 0xda00,
 };